-

{ pkgs ? import <nixpkgs> {} }:
let
  inherit (pkgs) lib stdenv ruby_2_3 rake bundler bundlerEnv openssl defaultGemConfig;

  rubyEnv = bundlerEnv {
    name = "mezzo";
    ruby = ruby_2_3;

    gemdir = ./.;

    gemConfig = defaultGemConfig // {
      tiny_tds = attrs: {
        nativeBuildInputs = [openssl];
      };
    };
  };
in
  pkgs.mkShell {
    buildInputs = [ruby_2_3 rubyEnv];
  }